Expose ReactReconciler

This can be used by devtools to monkey patch the reconciler and therefore
get notified whenever any internal instance is updated.

src/core/ReactReconciler.js

@@ -100,6 +100,20 @@ var ReactReconciler = {
     if (refsChanged) {
       transaction.getReactMountReady().enqueue(attachRefs, internalInstance);
     }
+  },
+
+  /**
+   * Flush any dirty changes in a component.
+   *
+   * @param {ReactComponent} internalInstance
+   * @param {ReactReconcileTransaction} transaction
+   * @internal
+   */
+  performUpdateIfNecessary: function(
+    internalInstance,
+    transaction
+  ) {
+    internalInstance.performUpdateIfNecessary(transaction);
   }
 
 };

src/core/ReactUpdates.js

@@ -15,6 +15,7 @@ var CallbackQueue = require('CallbackQueue');
 var PooledClass = require('PooledClass');
 var ReactCurrentOwner = require('ReactCurrentOwner');
 var ReactPerf = require('ReactPerf');
+var ReactReconciler = require('ReactReconciler');
 var Transaction = require('Transaction');
 
 var assign = require('Object.assign');
@@ -146,7 +147,11 @@ function runBatchedUpdates(transaction) {
     // stash the callbacks first
     var callbacks = component._pendingCallbacks;
     component._pendingCallbacks = null;
-    component.performUpdateIfNecessary(transaction.reconcileTransaction);
+
+    ReactReconciler.performUpdateIfNecessary(
+      component,
+      transaction.reconcileTransaction
+    );
 
     if (callbacks) {
       for (var j = 0; j < callbacks.length; j++) {